	Authors	Year	Title
	Cantú_Chapa	1997	Los Cefalópodos del Paleozóico de Mexico. Geosciencias, 1: 1-127, 75 text-figs., 15 pls., Mexico.
	Miller & Furnish	1940c	Permian ammonoids of the Guadalupe Mountain Region and adjacent areas. Special Papers of the Geological Society of America, 26: 1-242, fig.1-59, pl.1-44; Baltimore.
	Miller & Furnish	1957c	Ammonoids from the basal Word Formation, Glass Mountains, West Texas. Journal of Paleontology, 31 (6): 1052-1056, fig.1-2; Tulsa,Oklahoma.
	Termier, Termier & Desparmet	1972	Les Ammonoides du Permien (Kubergandien) de Tezak (Afghanistan central). [Termier,H., Termier,G., Desparmet,R. & Montenat,C.] Société géologique du Nord, Annales, 92: 105-115, 7 figs., pl.13-17, Lille.